Four factors are thought to possibly influence the taste of a soft-drink beverage: type of sweetener (A), ratio of syrup to water (B), carbonation level (C), and temperature (D). Each factor can be run at two levels, producing a 24 design. At each run in the design, samples of the beverage are given to a test panel consisting of 20 people. Each tester assigns a point score from 1 to 10 to the beverage. Total score is the response variable, and the objective is to find a formulation that maximized total score. Two replicates of this design are run, and the results are shown in Table 8E.3. Analyze the data and draw conclusions.

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Treatment Replicate Combination II 188 195 172 180 179 187 185 178 175 180 183 178 190 180 175 168 200 193 170 178 189 181 183 188 201 188 181 17:3 bcd 189 182 abcd178 182 ac bc bd abd acd